stack_map 105 samples/bpf/trace_event_user.c int fd = map_fd[0], stack_map = map_fd[1]; stack_map 121 samples/bpf/trace_event_user.c while (bpf_map_get_next_key(stack_map, &stackid, &next_id) == 0) { stack_map 122 samples/bpf/trace_event_user.c bpf_map_delete_elem(stack_map, &next_id);